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BartSMP [9]
3 years ago
10

Which object would best be identified by a periodic Doppler shift in a star's spectrum along with a dip in the stars light inten

sity?
a black hole
a nebula
a comment
a planet
Chemistry
1 answer:
IgorLugansk [536]3 years ago
5 0
The answer would be a planet<span>. Planets revolve around stars, which means there will come a point where the planet is between the star and our field of vision towards the star. This point will be where the star's radiation will have the lowest intensity. As the planet moves, the intensity will change. The effect is comparable to a lunar or solar eclipse.</span>
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When 6.889 grams of a hydrocarbon, CxHy, were burned in a combustion analysis apparatus, 20.17 grams of CO2 and 12.39 grams of H
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6 0
4 years ago
When designing an experiment, scientists make predictions about what results will occur if their hypothesis is correct. One of t
lesya692 [45]

Answer:

There is no formation of shmoos

Explanation:

If the hypothesis that says "Fus3 kinase is required for the signal transduction pathway leading shmoo formation" is correct, then a strain with a deletion Fus3, is not going to render Fus3 kinase, at least active.  By this reason, there will not be shmoo formation

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4 years ago
Part B When carbon is burned in air, it reacts with oxygen to form carbon dioxide. When 22.8 g of carbon were burned in the pres
aksik [14]

<u>Answer:</u> The amount of carbon dioxide gas produced in the reaction is 83.6 grams

<u>Explanation:</u>

As, some amount of oxygen gas is left after the reaction is completed. So, it is present in excess and is considered as an excess reagent.

Thus, carbon is considered as a limiting reagent because it limits the formation of product.

To calculate the number of moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}     .....(1)

Given mass of carbon = 22.8 g

Molar mass of carbon = 12 g/mol

Putting values in equation 1, we get:

\text{Moles of carbon}=\frac{22.8g}{12g/mol}=1.9mol

The chemical equation for the reaction of carbon and oxygen gas follows:

C+O_2\rightarrow CO_2

By Stoichiometry of the reaction:

1 mole of carbon produces 1 mole of carbon dioxide gas

So, 1.9 moles of carbon will produce = \frac{1}{1}\times 1.9=1.9moles of carbon dioxide gas

Now, calculating the mass of carbon dioxide from equation 1, we get:

Molar mass of carbon dioxide = 44 g/mol

Moles of carbon dioxide = 1.9 moles

Putting values in equation 1, we get:

1.9mol=\frac{\text{Mass of carbon dioxide}}{44g/mol}\\\\\text{Mass of carbon dioxide}=(1.9mol\times 44g/mol)=83.6g

Hence, the amount of carbon dioxide gas produced in the reaction is 83.6 grams

6 0
3 years ago
THIS IS SCIENCE What the metric base unit for length.
kozerog [31]

Length: The most common units that we use to measure length in the metric system are the millimeter, centimeter, meter, and kilometer. The millimeter is the smallest commonly used unit in the metric system

Mass: Kilogram.

Liquid volume: The basis of fluid volume units for the metric system is the liter. A liter is about the same as one quart.

  • The independent variable in an experiment is the variable whose value the scientist systematically changes in order to see what effect the changes have.
  • A dependent variable is what the experimenter observes to find the effect of systematically varying the independent variable.
  • Experimental constants are values that do not change either during or between experiments.
  • A controlled variable is a variable that could change, but that the experimenter intentionally keeps constant in order to more clearly isolate the relationship between the independent variable and the dependent variable.

(And psa. don't lie to people about the points earned!)

7 0
3 years ago
(giving brainiest)<br><br> please answer correctly im failing school and these are my last points!
vesna_86 [32]

Answer:

i answered your other post with it

Explanation:

4 0
3 years ago
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